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Why is feedback so useful for deliberate practice? In the article "Failure is not the Mother of Success, Success is the Mother of Success" by Teacher Wan Weigang, it is stressed that feedback is divided into two types: one is to accuse you of not being able to do it yourself, and this feedback will bring bad effects. 2 refers to the right thing, not that you can't do it, but that what you do can be better promoted through improvement. Effective feedback is that "good is failure" needs to meet three conditions. 1. Timely, if it is wrong, someone will point it out to you immediately. It is not right for people to be right for things. The cost of mistakes is small. This is more like the green light thinking in the learning mentality. To distinguish between "I" and "my view of behavior". I am very good myself, and my behavior and opinions can be changed.说道：我不愿杀你，所以也并不急着找你，但是你此刻出现在我的面前，那我就非杀你不可了。接着就是分发奖赏，其喧嚣热闹也无需一一细述。传说中，太阳系的每一颗星星都有一只守护星龙，它们都生活在星龙圣域里。但太阳系的黑洞无处不在，五百年复活一次的妖兽王，它的出现就像巨大的黑洞一样，笼罩了整个星龙圣域，吞噬阳光，吸取所有星龙的星象力量，一心想要统治整个太阳系，它就是——罗刹•暗无。　　托比·华莱士饰演年轻时代的史蒂夫·琼斯，路易斯·帕特里奇饰演贝斯手席德·维瑟斯，艾玛·阿普尔顿饰演饰演席德的女友南希。雅各布·斯 拉特饰演鼓手保罗·库克，法比安·弗兰克尔饰演贝斯吉他手格伦·马特洛克、迪兰·卢埃林饰演性手枪乐队前身河滨乐队的组建成员之一沃利·南丁格尔，麦茜·威廉姆斯饰演朋克偶像乔丹，安森·布恩饰演音乐人约翰·莱顿、西尼·钱德勒饰演摇滚乐手克里希·海德。Class has only one instance. Q: How can we guarantee it? Answer: Private constructors are used to ensure that classes cannot be instantiated outside the class.